定义一个时期

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How many working days in year 2091?

Here is the detail of the calculation:

Because 2091 is not a leap year, it has 365 days.

Let's remove 52 saturdays and 52 sundays. It remains 261 days.

Now, let's remove 5 public holidays that do not fall during a weekend and we obtain 256 working days in 2091.

Here is the list of these 5 public holidays:

1. New Year's Day : 2091年1月1日星期一
2. Good Friday : 2091年4月6日星期五
3. Labour Day : 2091年5月1日星期二
4. National Day : 2091年8月9日星期四
5. Christmas Day : 2091年12月25日星期二